Table 3 Pain intensity before and after NF: median, (quartile 1, quartile 3). The statistically significant level p = 0.05 (Mann Whitney U test)

P1^a

8.7 ± 1.2 (9)

6.0 ± 1.0 (6)

−31%^c

0.007

P2^ab

8.5 ± 0.7 (8)

5.5 ± 0.7 (5.5)

−35%^c

0.001

P3

8.7 ± 0.6 (9)

5.3 ± 0.6 (5.5)

− 38%^c

0.002

P4^ab

3.0 ± 0.5 (3)

2.4 ± 0.5 (2.5)

−18%

0.5e⁻⁵

P5^a

5.1 ± 0.6 (5)

4.5 ± 0.6 (4.5)

−10%

0.5e⁻⁶

P6

–

–

–

–

P7^a

4.5 ± 0.9 (4.5)

3.5 ± 0.9 (3.5)

−22%

0.001

P8

–

–

–

–

P9

–

–

–

–

P10^a

9.0 ± 0.7 (8)

5.5 ± 1.8 (5.5)

−38%^c

0.04

P11

4.0 ± 1.0 (4)

3.3 ± 0.6 (3)

−15%

0.08

P12

7.25 ± 0.5 (7)

4.3 ± 0.5 (4)

−34%^c

0.002

P13

–

–

–

–

P14

5.3 ± 1.0 (5)

3.7 ± 0.8 (4)

−28%

0.003

P15

–

–

–

–

P16^a

2.8 ± 0.5 (3)

0.7 ± 0.6 (1)

75%^c

0.5e⁻⁵

P17^a

5.4 ± 1.0 (6)

2.9 ± 1.3 (3)

−46%^c

0.5e⁻¹¹

P18^a

5.3 ± 2.1 (5)

4.7 ± 2.3 (4)

−15%

0.09

P19

5.8 ± 1.7 (5)

2.3 ± 1.7 (2.5)

−65%^c

0.0006

P20

7.3 ± 0.6 (7.5)

6.7 ± 0.6 (6.5)

−9%

0.09